Spray head



J1me 5- s. H. uzzARD |-:r AL 2,004,033

SPRAY HEAD I Filed Jan. 16, 1932 provedmeans it leaves the Patented June 4, i935 PATENT OFFICE -sraarnmn Gale H. Buzzard and Robert w. Tracy, Toledo, 0, assignor to The De Vilbiss Co mmny.

Toledo, Ohio, a corporation oi' oliio Application January 16,

1932, Serial No. 586,984

11 Claims. (oi. zoo-140.1)

This invention relates to a spray head primarily adapted for use in spray coating.

The object of the invention is to provide imfor shaping the spray stream as nozzle and more particularly to provide a spray having a clearly defined pattern with little or no spattering or overspray about the main body of the pattern.

"The invention will be more specifically explainecl in connection. with the accompanying drawing, in which I Figure 1 is a front elevation of the spray head;

Figure 2 is a longitudinal section taken on the line 2-2 of Fig. l;

Figure 3 is a partial section taken on the line 3-3 of Fig. 1;

Figure 4 is an enlarged sectional view of the tip of the fluid nozzle; s

Figure 5 represents a spray pattern as hitherto produced bya spray head with flattening jets, but without the shaping means provided by the present invention; vand Figure 6 represents a spray pattern'produced by a spray head constructed according to the present invention.

Our invention is adapted for'use in various types of spray heads. shown,

ing material is emitted and an outer nozzle l0 which controls the air. The rear end portion 02 the nozzle 8 is enlarged as shown at H and is connected in any suitable manner with the body of the spray gun l2. The enlarged portion I l of the nozzle 8 is formed with a suitable seat l3 against which the air nozzle I0 is held by a union nut H or other. suitable means.

The fluid tip 9 is provided with an orifice l5 through which the emission of the, spray material is controlled by a needle l6. The central outer portion of air nozzle I0 is in the form of a cap enclosing an air space I! having a main discharge orifice l8 surroundingthe fluid tip 9.

The nozzle I0 is also provided with a pair of forwardly and outwardly projecting horns I9 provided with oppositely disposed orifices 20 through which flattening air jets are discharged at an angle to the spray stream in a well known manner.

In accordance with our invention, the central cap-like portion of the air nozzle Ill is also provided with a pair of opposed orifices 2| disposed in' a plane at right angles to the plane of the orifices 2|. The diameter of the orifices 2| is about onehalf that of the orifices 20 and they are also 10- edges of the spray stream cated comparatively close to the main air orifice and have a smaller angle of convergence than the orifices 20 so that the air jets emittedfrom the orifices 2| impinge at a comparatively small angle against the spray stream between the fluid tip 9 and the region in which the flattening jets from the orifices stream.

It will also be noted that the outer end surface of the fluid tip 9 is in the same plane with the outer surface of the air nozzle l0 and is provided. with a circumferential edge 22 slightly rounded on a curve of .020" radius. Preferably the diameter of the orifice I8 is about .152" and the diameter of each orifice 2| is .039" while the diameter of each orifice 20 is .078". The axes of the orifices 2| are at an to the axis of the fluid nozzle orifices 20 are at of the nozzle.

In the operation of a spray head constructed in accordance with our invention, the smaller air jets from the orifices 2| impinge against the spray, stream between the end of the tip 9 and the vertex of the flattening jets from the orifices 20. These smaller jets with their comparatively small angle of convergence slightly flatten or smooth out the spray along the sides which later become the when the latter is fiattened by the larger air jets. In other words, the smallerjets tend to clean up the edges of the fan spray so that it .produces the pattern shown in Fig. 6, eliminating the spatter and overspray which would otherwise produce a pattern like that shown in Fig. 5.

The smaller jets also add to the atomizing air emitted from the orifice l8 in such a manner as to reduce the forward blow of the center air. This reduction of velocity helps to eliminate the wavy effect which occasionally appears as a'result of the force with which the spray hits the surface being coated. r

The rounded edge 22 tends to promote a smoother flow of the air from the orifice l8 and thus to clean up the pattern all around.

and the axes of the an inclination of 50 to the axis While we have described in considerable detail the preferred form 0! the vious that the same may be fled without departing materially from the scope of the appended claims.

What is claimed is:

1. A spray head comprising means for discharging air and material to form a spray stream, means for d separate supplemental convergent air Jets against opposite sides of the invention, it is ob- 20 engage and flatten the spray inclination of 20 flatten the same,

plane of spray stream to flatten the same, and means 1m discharging other supplemental air jets against opposite sides oi the stream in a plane at right angles to the plane of the first mentioned supplemental jets and with a smaller angle or convergence to lessen the sputtering from the edges of the flattened stream.

2.' A spray head comprising means for discharging air and material to form a spray stream, means for discharging separate supplemental air jets against opposite sides oi the spray stream to and means for causing other supplemental air jets to impinge against the stream in a plane at right angles to the plane of the first mentioned supplemental jets and nearer to the spray head than the first mentioned jets, to lessen the spattering from the edges of the stream as flattened by the first mentioned supplemental jets.

3. A spray head comprising means for discharging air and material to form a spray stream, means for discharging separate supplemental air jets against opposite sides' of the spray stream to flatten the same, and means for discharging other supplemental air jets aga nst opposite sides of the stream in a plane at right angles to the to. lessen the spattering from the edges of the flattened stream, said other supplemental jets being smaller than the,first mentioned jets.

4. A spray head comprising means for discharging air and material to form a spray stream, means for discharging supplemental air jets against opposite sides of the stream to flatten the same, and means for causing other supplemental air jets to impinge against the stream in a plane at right angles to the plane of the first mentioned supplemental jets and nearer to the spray head then the first mentioned jets, said other supplemental jets being smaller than the first mentioned jets.

' 5. A spray head comprising an outer air nozzle and an inner material nozzle having a tip disposed in the main orifice oi the air nozzle, said tip having a rounded circumferential edge at its outer end, said air nozzle being provided with a main orifice concentrically surrounding said material nozzle and with opposed supplemental orifices for discharging supplemental convergent air jets against opposite sides of the spray stream to flatten the same and other opposed orifices for discharging supplemental jets against the spray stream in a plane at right angles to the plane of the first mentioned supplemental jets and with a smaller angle of convergence.

6. A spray head comprising an outer air nozzle and an inner material nozzle having a tip disposed in impinge against the stream in a plane at right angles. to the plane. of the first mentioned supthe first mentioned supplemental jetsthe main orifice of the air nozzle, said tip having a rounded circumferential edge at its 4 plemental jets and nearer to the spray head than the first mentioned jets, to lessen the spattering irom the edges of the stream as flattened by the first mentioned supplemental jets.

'7. A spray head comprising an outer air nozzlo and an inner material nozzle having a tip disposed in the main orifice of the air nozzle, said tip having a rounded circumferential edge at its outer end, saidair nozzle being provided with op= posed supplemental orifices for discharging supplemental air jets against opposite sides of the spray stream to flatten the same, and other opposed orifices so disposed as to emit jets which impinge against the stream in a plane at right angles to the plane of the first mentioned supplemental jets, said other opposed orifices bein of less diameter than the first mentioned supplemental orifices.

8. A spray head comprising an outer air nozzle and an inner material nozzle having a tip disposed in the main orifice of the airnozzle, said tip having a rounded circumferential edge atts outer end, said air nozzle being provided with opposed supplemental orifices tor discharging supplemental air jets against opposite sides of the spray stream to flatten the same, and other opposed orifices so disposed as to emit jets which impinge against the stream in a plane at right angles to the plane of the first mentioned supplemental jets and nearer to the spray head than the first mentioned jets, said other opposed orifices being of less diameter than the diameter oi the first mentioned supplemental orifices.

9. A spray head comprising means to discharge an air supported stream of coating liquid, means for discharging separate supplemental air jets acting on said stream to form the same, and

means for discharging other supplemental airjets against opposite sides of the stream in a plane at right angles to the plane or said first jets to flatten the stream, said last mentioned supplefirst jets have acted upon the stream.

10. A spray head comprising means to dis= charge an air supported stream of coating liquid, means on opposite sides oi said stream for discharging separate supplemental air lets to act on said stream, and other means on opposite sides or said stream and disposed in a plane at an angle to said last means and farther iroin said stream for discharging flattening air jets against said stream.

11. A spray head comprising means for discharging an air supported. stream of coating liquid, means for discharging separate supplemental air jets against opposite sides 0! said stream to flatten said stream, and means, for causing other separate supplemental air jets to impinge against the stream in a plane at right angles to the plane of the first mentioned supplemental jets to lessen the spattering from the edges of the stream, said last means being disposed nearer to the stream than said first jets.

GALE H. BUZZARD; ROBERT W. TRACY.

CERTIFICATE or CORRECTION.

Patent No. 2, 004, 033. June 4, 1935.

GALE H. 'BUZZARD, ET AL.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 2, first column, line 33, claim 4, after "discharging" insert the word separate; and line 34, before "stream" insert the Word spray; same page and column, line 60, and second column, lines 9 and 23, claims 6, 7 and 8 respectively, after "with" insert the words a main orifice concentrically surrounding said material nozzle and with; and that the said Letters Patent should be read with these corrections therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 16th day of July, A. 1935.

Leslie Frazer (Seal) Acting Commissioner of Patents. 

